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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Identify `X` and `Y` in the following reactions . `PbS underset("in air") overset (Heat) (rarr) (X)` `(X) + PbS overset (Y) (rarr) pb+SO_(2)`. |
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Answer» `PbS` on heating in air produces either `PbO` or ` PbSO_4` , hence `(X)` is ` PbO` or `PbSO_4` . `2 PbO + PbS overset ((Y) = ?) (rarr) 3Pb + SO_2` or `undersrt ((X)) ( PbSO_4) +PbS overset ((Y)= ?) (rarr) 2 P b + 2 SO_2` (Y) is heat at high temperature , in the absence of arei . |
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| 2. |
Assertion (A) :` Pb^(+4)` compounds are stronger oxidiising agents than ` Sn^(4+)` compounds . Reason (R): The higher oxidation states for group `14` elements are more stable for the heavier members of the group due to inert pair effect .A. If bothe (A) and ( R) are correct and (R) is correct eplanation of (A)B. If bothe (A) and ( R) are correct and (R) is correct eplanation of (A)C. If (A) is correct , buyt (R) is incrorect .D. If (A) is incrorect byt ( R) is correct . |
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Answer» Correct Answer - C Aswsertion (A) is true , reason (R) is false . Down the group , the inert pair effect incerases , therefore , the higher oxidation state becomes less stabnle , and the lower oxidation state becomes more stable down the proup .`Pb^(4+)` has a higher tendency to pass into `Pb^(2+)` and is , therefore , a good oxidisng agent compared to `Sn^(4+)`. |
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| 3. |
Assertion (A) :` Pb^(+4)` compounds are stronger oxidiising agents than ` Sn^(3+)` compounds . Reason (R): The higher oxition states for grouup `14` eelments are more stable for the heavier members of the frop due to inert pair effect .A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is not correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct . |
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Answer» Correct Answer - C Correct reason : Lower oxidation states for the group `14` elements are more stable for haveier members of the frop due to linet apir efficet . |
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| 4. |
vii. The stability of dihlides of ` Si, Ge , Sn` and Pb increases steadily in the sequence :A. `PbX_(2) lt SnX_(2) lt GeX_(2) ltSiX_(2)`B. `GeX_(2) lt SiX_(2) ltSnX_(2) ltPbX_(2)`C. `SiX_(2)ltGeX_(2) ltPbX_(2) ltSnX_(2)`D. `SiX_(2) ltGeX_(2) ltSnX_(2) ltPbX_(2)` |
| Answer» vii. As down the group `(narr)`, the stability of lower oxidation state , i.e `+4` in group `14` increases . | |
| 5. |
Assertion: `Pb^(4+)`can be reduced easily to `Pb^(2+)`. Reason: `Pb^(2+)` is paramagnetic.A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incrorect byt (R) is incroroect . |
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Answer» Correct Answer - C Correct assertion :Due to inert pair effect, `Pb^(4+)` gets easily reduces to `pb^(2+).Pb^(2+).Pb^(2+) (6s^(2))` is diamagnetic, |
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| 6. |
`CO_2` and `H_2 O` absorbs strongly in the infrared rrgion and its presence in the atmospheere dectrases the loss fo heat form the enrth by radistiion . This global warming is called the greenhouse effect (other gases , including the oxides of nitraongen form car exhauset freons from aerosols and refrigeratirs and methane from bacteria in the soil and in the rument cows , also add to the reeenhouse effect ). The concentration fo atmospheric `CO_2` has increased by `10%` . The is rsulting in the increase in the mean temperature fo the earth by `2. 5^@ C`, varying form `2^@ C` t the equlator to `4^@ C` at the poles . This could have dramatic effects on the climate. Instead of monitoring carbon dioxide suggest another gas that scientists could studey to substantiate the fact that ` CO_2` conentration is steadily increasing in the atmosphere ?A. `N_2O`B. `O_2`C. `CH_4`D. `O_3` |
| Answer» Correct Answer - B | |
| 7. |
`CO_2` and `H_2 O` absorbs strongly in the infrared rrgion and its presence in the atmospheere dectrases the loss fo heat form the enrth by radistiion . This global warming is called the greenhouse effect (other gases , including the oxides of nitraongen form car exhauset freons from aerosols and refrigeratirs and methane from bacteria in the soil and in the rument cows , also add to the reeenhouse effect ). The concentration fo atmospheric `CO_2` has increased by `10%` . The is rsulting in the increase in the mean temperature fo the earth by `2. 5^@ C`, varying form `2^@ C` t the equlator to `4^@ C` at the poles . This could have dramatic effects on the climate. As a result of freenhouse effect , thers can be : A: an increase in rate of egvaporation of water thus, untimely more rain , floodingn tec . B: tropical storms in certain parts of the workd C: a decrease in `pH` of the soil D: an increase in `pH` of the soil select correct altemate :A. `B,C,D`B. `A,C,D`C. `A,B,D`D. `A,B,C` |
| Answer» Correct Answer - D | |
| 8. |
`CO_2` and `H_2 O` absorbs strongly in the infrared rrgion and its presence in the atmospheere dectrases the loss fo heat form the enrth by radistiion . This global warming is called the greenhouse effect (other gases , including the oxides of nitraongen form car exhauset freons from aerosols and refrigeratirs and methane from bacteria in the soil and in the rument cows , also add to the reeenhouse effect ). The concentration fo atmospheric `CO_2` has increased by `10%` . The is rsulting in the increase in the mean temperature fo the earth by `2. 5^@ C`, varying form `2^@ C` t the equlator to `4^@ C` at the poles . This could have dramatic effects on the climate.Which of the following is growing at a fastre rate than ` CO_2` and thus responsible for the greenhouse effect ?A. `CFC`B. `N_2O`C. `O_3`D. `CH_4` |
| Answer» Correct Answer - A | |
| 9. |
Assertion (A) : `CO_2` is a gas but `SiO_2` had a three -dimenstional network structurte . Reason (R): `CO_2` bonds nut `SiO_2` has a three-dimensional network structure .A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is not correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct . |
| Answer» Correct Answer - A | |
| 10. |
` CO_2` is used for extinguisng fire because it is neither combustible not a supporter of combustion . |
| Answer» Correct Answer - T | |
| 11. |
A bottle of fire exitingushers contain `H_(2)SO_(4)` and:A. `CaCO_3`B. `Na_2O_2`C. `Na_2O_2`D. Any carbonate |
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Answer» Correct Answer - C `H_2SO_4 +2NaHCO_3 rarr Na_2SO_4 +2CO_2 +2H_2O CO_2` produced help in extinguishing fire . |
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| 12. |
In the carbon family , the elements other than carbon do not form ` pn-p pi` nonds because the atomic orbitals are :A. Small and diffuse to undergo effective lateral overlapB. Large and diffuse to undrgo effective lateral overlapC. Large and for too less diffuse to overlap lineralyD. Small to overlap both laterally and linearly |
| Answer» Correct Answer - B | |
| 13. |
The interlayer distance in graphite isA. Very smll the layrs being tihtly packedB. Many times larfger rhan the comvalent radius fo carbnon more than twic the covalent eradius fo carbon theC. ThMore than twice he covalent radius fo carbnonD. The same as the covalent raidus fo carbon |
| Answer» Correct Answer - C | |
| 14. |
Assertion (A) : Graphite si a good conductore of heat and electriciy . Reason (R) : Frre electron are sjperaldout in the structrue of graphite .A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is not correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct |
| Answer» Correct Answer - A | |
| 15. |
Lead dissolves most readily inA. acetic acidB. sulphuric acidC. nitric acidD. hydrochloic acid |
| Answer» Correct Answer - C | |
| 16. |
Give reasons for the following : a. `Snl_4` is orange in colur . b. Solid ice is known as dry ice . c. Diamond is inert , wheresas gfraphite is not . d. Nitrolim acts as a good nitrogenous fertiliser . |
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Answer» a. `Snl_4` absorbs bleu light and reflects high proportion of orange or red . The ergy avbsorbed in this way causes he transfer of an electron from `I` to `Sn` which correspond to the temporary oxidation of `Sn (IV)` to `Sn(III)`. Sice transferring an electron to another atom is same as transferring a charge charge transfer complex is formed and due to whcih `Snl_4` is roange in colou. b. Solid ice at `1` atm pressure sublimes i.e., changes form slid state to gaseou sate without liquefying . As a result , solid ice does not wet the surface and is known as dry ice . c. In diamojnd each `C` atom si `sp^3` hybrdised and a C-atom si terahedrally bonded to foru other c-atoms whcih emans there is no unpaired electron left in the struture of diamond . Hence it is incer , whereas in graphite `C` is `sp^2` hyvbrised and ther si one upared eelctron on each `C` atom which is free and hence due to availabiluty of unpaired electrons grahite is reactive . d. Nitrolim is `CaNCN` , i.e., calcium, into calcium carbonate and cyanamide . `CaNCn + H_2 O +CO_2 rarr CaCO_2 darr + underset (Cyanamide) (H_2 N.CN)` the ctyanamide then ghydrolyses into two steps : i. `H_2 N.Cn +H_2O rarr H_2 underset (Urea) (NCONH_2)` ii. ` H-2 CONH_2 +H_2O rarr 2NH_2 +CO_2 uarr` Ammonia `(NH_3)` is converted into intrates by nitrifying vacterica . On account of its show conversion into intrates and `NH_3`, nitrolim or `CaNCN` acts as a goode nitrogenous fertiliser. |
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| 17. |
Give reason for the following in one or two sentences : 'Solid carbon dioxide is known as dry ice.' |
| Answer» If `CO_2` under pressure is allowed to escape through a nozzle , a white solid called dry ice is obtained. Solid ` CO_2` is a soft , white snow -like substance. It sublimes and leves no residue. Som it is Knows as dry ice. | |
| 18. |
Structureal units fo ice and dry ice are , respectively .A. `H_2 O, CO`B. `H_2O, CO_2`C. `CO_2, H_2O`D. `CO, CO_2` |
| Answer» Correct Answer - B | |
| 19. |
How many moles of methance are obntined by the hydrolsis of one mole of aluminum carbide ? |
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Answer» Correct Answer - 3 `Al_4 C_3 + 12 H_2O rarr 4 A l(OH)_3 +3 CH_4 3` moles of `CH_4` are produced . |
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| 20. |
c. When a mixtgure of air and steam is passsed over red bot coke , the outgoin gas contains ……………….. |
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Answer» Red hot coke `underset (steam ) overset (aire ) (rarr) ?` `C+underset((air))(O_(2))+N_(2)rarr ubrace(COuarr+N_(2)uarr)_("Producer gas")` `Cunderset(Steam)(+H_(2)O)rarr ubrace(COuarr+H_(2)uarr` Hence , when a mixture of air and steam is passed over red hot coke , the outging gas contains producer gas and water gas . |
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| 21. |
A white coloured inorgatnic salt formed by an element fo group `14` give the following reactions : a. It is soluble in water and the solution has sweet taste . The salt when heate gives acetone and a yellow colured reside which is used in paints . ltbr. e. The solution of the salt gives a wihiter precipitate with dil HCi which is soluble in hot water . Explain the above observations with chemicl reactions invovled . |
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Answer» White coloured inorganic salt formed by an element of group `14` is lead acetate, `(Ch_(3)COO)_(2)Pb`, which is commonly known as sugar of lead. ` (CH_3COO)_2 Pb + 2H_2O rarrr 2CH_3 COOH + Pb(OH)_2` b. Lead acetate on heating decompeses to give acetone and `PbO`, a yellow coloured residue which is used in painsts . `(CH_(3)COO)_(2)Pb overset(Heat)(rarr)underset(("Yellow residue")) underset("Lead chloride) (PbCl_(2) darr+)2CH_(3) COOH` c. When dil `HCl` is added to the solution of lead acetate . a white ppt. of `PbCl_2` appears which is insluble under cold conditions , but dissolves on heating `(CH_3 COO)_2 Pb +2HCL rarr underset (("white ppt.")) underset ("Lead chloride") (PbCl)2 darr + 2CH_3COOH`. |
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| 22. |
Assertion (A) : Aluminum is passive towares conc ` HNO_2` Reason (R) : Due to formation of layer of nitrate on aluminiumA. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is not correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct . |
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Answer» Correct Answer - C Correct reason : Due to formation of oxide layer of `Al_2 O_3` on the surface . |
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| 23. |
When steam reacts with red bot coke to form` co_2` and hydrogen :A. Water acts as oxidising agentB. Water acts as a reducing agentC. Carbon acts as an oxidising agentD. There is no oxidation or reduction . |
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Answer» Correct Answer - A `underset (Steam) H_2O + Crarr CO_2 +H_2` `H_2O` oxidises `C rarr CO_2` benceed `H_2 O` acts asd oxidisng agent . |
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| 24. |
Which gas is evolved when `PbO_(2)` is treated with conc `HNO_(3)` ?A. `NO_2`B. `O_2`C. `N_2`D. `N_1O_2` |
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Answer» Correct Answer - B `PbO_2 + 2HNO_3 rarr Pb(NO_3)_2 + H_2 O + 1/2 O_2 uarr`. |
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| 25. |
An element of group ` 14` form a red coloured mized oxide (A) which on treatment with conc `GnO_3` gives compound (B) , (B) reacts with `HCl` to produce a choloride (C) , which is insolubil in cold water hut solububle in ot water . (A) on reaction with conc `HCl` produces (C) . Identify (A), (B) and (C) . |
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Answer» Lead (Pb) forms a red-coloured mixed osice , known as red lead `Pb_3 O_4` (A) , which is a mixed oxide of `PbO_2` and `PbO` in the ration `1: 2`. ` (##KSV_INORG_CHM_P1_C07_S01_020_S01.png" width="80%">. `underset ((A)) (Pb_3O_4) + 4 HN underset (conc)(NO_3 )rarr (2PbNO_3)_2 +PbO_2 +2H_2 O` `underset ((B)) (Pb (NO_3)_2) + 2HCl rarr underset (White ppt . ) ((C )) (PnCl_2harr) + 2 HNO_3` ` (C ) PbCl_2` is insoluyble in cold wate but soluble in hot water . ` underset ((A)) (Pb _3 O_4 )+underset (conc)(8 HCk) rarr underset ((C))(3 P bCl_2) + 4H_2O +Cl_)2` `Pb _3O_4` actgs as an oxidising agent and oxidses `2 Cl^(Θ) rarr Cl_2` Hence . (A) is `Pb_3O_4` , red lada ltbgt (B) is `Pb(NO_3)` lead nitrate (C) is ` PbCl_2` lead (II) chloride . |
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| 26. |
Which of the following carbides on treatment with water give methane ?A. ` CaC_2`B. `Be_2C_`C. `Al_4C_3`D. `Mg_2C_3` |
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Answer» Correct Answer - B::C `Be_2C +4H_2O rarr 2Be(OH)_2 underset("Methane") ( CH_4)` `Al_4C_3 +12H_2O rarr 4A l(OH)_3 + underset ("Methance")` `CaC_2+2H_2 O rarr Ca(OH)_2 + underset ("Acetaylenc")` `Me_2gC_3 + 4H_2O rarr 2Mg(OH)_2 + underset ("Propne") (HC -= C-CH_3)`. |
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| 27. |
The anhydride of carbonic acid is :A. `CO`B. `CO_2`C. `C_3O+2`D. none of these |
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Answer» Correct Answer - B `underset ("Carbonic ancid") H_2 CO_3 overset (Delta ) H_2 O + CO_2` . |
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| 28. |
A fuel will have alarge fueld velaue when one gram of it on heationg gives more of.A. `CO_2`B. `Ash`C. Water vapoursD. Calories |
| Answer» Correct Answer - D | |
| 29. |
ii. `Al_4 C_3` on hydrolysis givesA. `CH_(4)`B. `C_(2)H_(6)`C. `C_(2)H_(4)`D. `C_(2)H_(2)` |
| Answer» ii. `Al_4 Cl_3` on hydrolysis gives methane `(CH_4) Al_4C_3 + 12H_4C rarr underset ("hydrooxide") underset ("Aluminum") ( 4 A l (OH)_3) + underset ("Methane") (3 CH_4) uarr` . | |
| 30. |
iii. In ` SiF_6^(2-) ` and ` SiCl_6^(2-)` , which one is known and why ?A. `SiF_(6)^(2-)` because of the small size of `F`.B. `SiF_(6)^(2-)` because of the large size of `F`.C. `SiCl_(6)^(2-)` because of the small size of `Cl`.D. `SiCl_(6)^(2-)` because of the large size of `Cl`. |
| Answer» ii. Due to steric hindrance , `Si ` connot accommodate si large `Cl^(Θ)` ion around it. | |
| 31. |
Bucky ball Buckministerfulleren is |
| Answer» Buckminsterfullerene or bucky ball is an allotrope of caron. often refeed to as ` C_(60)` in which `C` is `P^2` hybridised and he strurcture resembles a soccer ball . | |
| 32. |
Which of the following metals in an ujmportant ingredient fo transiontors ?A. OsmiumB. GermaniumC. GoldD. Sodium |
| Answer» Correct Answer - B | |
| 33. |
The most unstable compounds fo the following are :A. hydrides of CB. hydrides fo SnC. hydrides of GeD. hydrides of Pb |
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Answer» Correct Answer - D Due to weak b ond strength of ` pb -H` bond . |
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| 34. |
Which of the following is a good conductors of electricity?A. DiamondB. GraphiteC. CoalD. None fo these |
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Answer» Correct Answer - B Due to the presence fo unpaired eelctron on each carbon atom in graphite , it behaves as a good conductor of eelctricity . |
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| 35. |
The specties present in slution when ` CO-2` is dissolved in water are :A. ` H_2CO_3, CO_3^(2-)`B. `HCO_3^(o+),CO_3^(2-)`C. `CO_2 H_2CO_3`D. `CO_2 H_2 CO_3 HCO_3^(o+) CO_3^(2-)` |
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Answer» Correct Answer - D `CO_2 +H_2O hArr H_2 CO_3 hArr H^(o+) + HCO_3^(o+) hArr H^(o+) +CO_3^(2-)` Hence , species present in solution are `CO_2, H_2 CO_3` `HCO_3^(Θ), CO_3^(2-)`. |
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| 36. |
Assertion (A) : Lead leaves a black amrek on paore Reason (R) : Lead is used for making lead pencils .A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is not correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct . |
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Answer» Correct Answer - C Correct reason : Graphite is used for making lead pencils . |
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| 37. |
The substance used as a smoke sereen in warfre is .A. ` SiCl_4`B. ` Sn Cl_4`C. `PbCl_4`D. `GECl_4` |
| Answer» Correct Answer - A | |
| 38. |
The element which forms only one hydride is :A. ` C`B. ` Si`C. ` Ge`D. `Pb` |
| Answer» Correct Answer - D | |
| 39. |
In the manufacture fo giass , the addition fo ` Mao_2` gives ,A. Yellow colorB. Red colourC. Violet coloutD. Pink colour |
| Answer» Correct Answer - D | |
| 40. |
Assertion (A) : When `CO_2` is passed through lime water the soluting turns miky but with an excess of `CO_2` the solution ehcomes calear agnin . Reason (R) : Excess `CO_2` changes the seupension to a colloidal solution .A. If both (A) and (R) are correct and (R) is correct explanation of (A)B. If both (A) and (R) are correct and (R) is not correct explanation of (A)C. If (A) is correct , but (R) is incorrectD. If (A) is incorrect but (R) is correct . |
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Answer» Correct Answer - C Correct reason : `Ca (OH)_2 + CO_2 rarr underset (("Milkiness")) underset ("Calcium Carbonate") (CaCO_3 +H_2O)` `CaCO-3 + CO_2 +H_2 O rarr underset ("Calicum bicarbonate") (Ca(HCO_3)_(2(aq))`. |
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| 41. |
Which of following is known as pyrene ?A. `CS_2`B. `Al_4C_3`C. `CCl_4`D. `Solid CO_2` |
| Answer» Correct Answer - C | |
| 42. |
The use fo diamond as a gem depends on itsA. hardnessB. high refractive indexC. purest form fo carbonD. chemical inertenss |
| Answer» Correct Answer - B | |
| 43. |
Coal gas .A. burns with a smoky flamB. burns with non-smoky flameC. is a good fuelD. is not use for lighting purposes |
| Answer» Correct Answer - B::C | |
| 44. |
viii. Which is likely to show inert pair effict ?A. `K`B. `Mg`C. `Al`D. `Pb` |
| Answer» viii. Due to the presence of fully filled lesser shielding d-and f-orbital electrons between boble gas and valence shell electron lead (Pb) will shown inert parie effect . | |
| 45. |
What are silliconet ? (Solved NCERT Problem 11.8)`. |
| Answer» Simple sillicones consist of ` (##KSV_INORG_CHM_P1_C07_S01_006_S01.png" width="80%">chains in which alkyl or phencyl groups occupy the remaining bonding positons on eacgh silicon . They are hydrophobic (water rpeellabnt ) in nature . | |
| 46. |
Which is //are likely to show inert pair effect ?A. ` K`B. `Mg`C. Ga`D. `Pb` |
| Answer» Correct Answer - C::D | |
| 47. |
On fusion of a mixture of `Na-2CO_3` and ` CaCO_3` with silica at `1500^@C`, a liquid consisting of silicatees of sdium and calcium is formed. On cooling . Liquid become viscous and eventually ceasesto flow . It becomes solid and is known as flass. By varying the proportions of the three basic ingredients and by adding other substances, the properties of glass can be altered, Glass can be represented as `R_2 O. MO.6SiO_2`, where `R= Na` or `K, M = CaBa, Zn` or `pbSiO_2` may be replaced by `Akl_2 O_3 , b_2 O_3` or `P_2 O_5`. Colourd glasses are obtained by adding certain metallic oxdes or salts in the fused mass, Glass is attached by `HF` and this property is used to make marking on the galss , This is known as etching . The glass on rapid coolling becomes brittle and fragile . The artciles of glass are cooled neither slowly nor very rapidly . The process of graducal cooling of flass iscalled annealing . Blue collour can be imparted to the flass by.A. `CoO`B. `Fe_2O-3`C. `NiO`D. `Cu_2O` |
| Answer» Correct Answer - A | |
| 48. |
Silicones are sunthetic polyners conitainging repeated `R_2 SiO` units . Since the empirical formula is that of a ketone `(R_2 CO)`, the name Silicone has eeen given to these materils . Siliconse can be makde intio oils , rubbery eleastomers and resins . They find a varely of appoications because of their chemical inctness , water repelling nature m heat resistance and good electical insulationg property . Commerical silicon polumers are usuallly metghly synthesised by the hudroluysis of ` R_2 SiCl_2 [R = Methyl (Me ) or phenyl ( phi)]` . If we mix `SiMe_3Cl` with `SiMe_2Cl_2` , we get silicones of the type .A. B. C. both of the aboveD. none fo the above |
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Answer» Correct Answer - A `Si Me_3Cl overset (H_2O) Si Me_3OH` ` Si Me_2Cl_2 overset (H_2O)/(rarr) Si Me_2 (OH)_2` ` (##KSV_INORG_CHM_P1_C07_E01_078_S01.png" width="80%"> |
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| 49. |
HgCl_2` and `SmCl_2` cannot exist together in an aqeous solution . Explain. |
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Answer» `Sn Cl_2` is a strong reducing agent and hence reduces `HeCl_2` first to `HgCl_2` ( white ) and then to `Hg` ( black ). Hence , these do not exist together . `SnCl_2 2 hgCl_2 rarr SnCl_4 + Hg_2Cl_2` `SnCl_2 + Hg_2Cl_2 rarr SnCl_4 +Hg`. |
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| 50. |
` C_(60)` conainsA. `20` pentagons and `12` hexagonsB. ` 12` pentagons and ` 20` hexagonsC. ` 30` pentagons and ` 30` hexagonsD. `24` pentagons and `36` hexagons |
| Answer» Correct Answer - C | |